<template>
  <el-container>
		<el-aside style="padding:15px;width: 400px;">
			<el-card shadow="never" header="异步加载JS">
				<div style="line-height: 1.5;font-size: 13px;">
					<p>演示了使用 @/utils/load 加载百度地图的JSAPI和它的GL库BMapGLLib</p>
					<p>当然也可以像传统网页一样加载任何JS和CSS，甚至可以是JQ。</p>
					<br/>
					<el-alert title="这是一项试验工具, 具有不稳定性" type="warning" show-icon :closable="false" />
				</div>
			</el-card>
		</el-aside>
		<el-main class="nopadding">
			<div style="width: 100%;height: 100%;" id="container" />
		</el-main>
	</el-container>
</template>

<script setup>
import {onMounted} from 'vue'
import {loadJS} from '@/utils/load'

onMounted(() => {
  init()
})

async function init(){
  var ak = "vxSbZuydZ42ktZCvXvy5xCai28OEVqUq"
  //loadJS (src, keyName, callbackName)
  //src 			必填，需要加载的URL路径
  //keyName 		必填，有2个作用，作为唯一KEY防止N次插入DOM；作为JS返回对象的key名，类似百度地图的BMapGL，如果没有则返回null
  //callbackName 	非必填，如果远程JS有callback，填写callback方法名称。
  //loadJS返回Promise，如果全局对象eslint发出警告 需要//eslint-disable-next-line，暂时关闭警告行
  //																							╭───这两个字符串要一致───╮
  const BMapGL = await loadJS(`//api.map.baidu.com/api?type=webgl&v=1.0&ak=${ak}&callback=BMapGLinit`, "BMapGL", "BMapGLinit")
  //像BMapGLLib就没有callback，无需第3个参数
  const BMapGLLib = await loadJS("//api.map.baidu.com/library/LuShu/gl/src/LuShu_min.js", "BMapGLLib")


  const map = new BMapGL.Map('container')
  map.centerAndZoom(new BMapGL.Point(116.297611, 40.047363), 20);
  map.enableScrollWheelZoom()
  map.setTilt(55)
  map.setDisplayOptions({
    poiText: false,
    poiIcon: false
  })

  var path = [{
    'lng': 116.297611,
    'lat': 40.047363
  }, {
    'lng': 116.302839,
    'lat': 40.048219
  }, {
    'lng': 116.308301,
    'lat': 40.050566
  }, {
    'lng': 116.305732,
    'lat': 40.054957
  }, {
    'lng': 116.304754,
    'lat': 40.057953
  }, {
    'lng': 116.306487,
    'lat': 40.058312
  }, {
    'lng': 116.307223,
    'lat': 40.056379
  }];
  var point = [];
  for (var i = 0; i < path.length; i++) {
    point.push(new BMapGL.Point(path[i].lng, path[i].lat));
  }
  var pl = new BMapGL.Polyline(point, {
    strokeColor: "blue",
    strokeWeight: 10,
    strokeOpacity: 0.5
  });
  map.addOverlay(pl);
  var lushu = new BMapGLLib.LuShu(map, pl.getPath(), {
    autoCenter: true,
    icon  : new BMapGL.Icon('../../assets/img/logo.png', new BMapGL.Size(30,30)),
    speed: 30,
    enableRotation: true
  });
  const timer = setTimeout(()=>{
    lushu.start()
    clearTimeout(timer)
  },1000)
}
</script>
